冷湖地区古近系储层成岩作用特征及其对孔隙演化的影响

油气藏评价与开发 ›› 2018, Vol. 8 ›› Issue (2): 7-13.

冷湖地区古近系储层成岩作用特征及其对孔隙演化的影响

陈波^1,²,孙国强²,史基安²,郝媛媛¹,石海信¹,陈汾君³

^1. 钦州学院广西高校北部湾石油天然气资源有效利用重点实验室,广西钦州535000
^2. 甘肃省油气资源研究重点实验室/中国科学院油气资源研究重点实验室,甘肃兰州 730000
^3. 中国石油青海油田分公司勘探开发研究院,甘肃敦煌 736202

收稿日期:2017-06-16 出版日期:2018-04-30 发布日期:2018-04-30
作者简介:第一作者简介:陈波(1985—),男,博士,油气储层地质学及油气藏开发
基金资助:
广西中青年教师基础能力提升项目“北部湾涠西南凹陷储层构型特征对油田含水率的影响研究”(2017KY0787);钦州学院校级重点培育项目“文昌油田储层构型及其剩余油分布特征研究”(2016PY-SJ10)

Diagenesis of Paleogene formation in Lenghu region and its impact on porosity evolution

Chen Bo^1,²,Sun Guoqiang²,Shi Ji'an²,Hao Yuanyuan¹,Shi Haixin¹,Chen Fenjun³

1.Key Laboratory of Utilization of fine Oil and Natural Gas Resource in Guangxi Province, Qinzhou University, Qinzhou, Guangxi 535000, China
^2. Key Laboratory of Petroleum Resources in Gansu Province/Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China
^3. Exploration & Production Research Institute of Qinghai Oilfield Company, PetroChina, Dunhuang, Gansu 736202, China

Received:2017-06-16 Online:2018-04-30 Published:2018-04-30

摘要/Abstract

摘要：

应用钻井取心资料,岩石薄片,铸体薄片,扫描电镜及测录井资料,同时结合分析化验数据,对冷湖地区古近系储层的成岩作用特征及其对储层孔隙的影响进行了细致研究.结果表明:冷湖地区古近系储层成熟度较低,储层中原生孔隙,次生孔隙和微裂缝均有发育,储层物性较差;成岩作用类型多样,对储层物性影响较大的主要为压实作用,胶结作用和溶蚀作用,其中压实作用是破坏储层物性的最根本原因.研究区储层整体因压实作用造成的孔隙度损失平均达21.65 %,胶结作用是使储层物性进一步减少的重要因素,造成孔隙损失平均达3.34 %,溶蚀作用是储层增孔的重要途径,但由于溶蚀流体的缺乏使其贡献有限,增孔约为2.26 %.储层物性与成熟度成正相关性,与埋藏深度成负相关性,表现为低成熟度和深埋藏的路乐河组(E₁₊₂)压实和胶结作用最强,储层物性最差,下干柴沟组下段(E₃ ¹)次之,成熟度最高和埋藏最浅的下干柴沟组上段(E₃ ²)储层物性最优.

关键词: 柴达木盆地, 冷湖地区, 古近系, 成岩作用, 孔隙演化

Abstract:

By using the drilling coring data, rock thin section, cast thin section, scanning electron microscope and logging data, and combined with the analysis of the test data, the diagenesis characteristics and its impact on reservoir porosity of Lenghu region of Paleogene has been carried on by the detailed study. The results showed that the maturity of the Lenghu region is low, the primary pore, secondary pore and micro cracks are both developed in the reservoir. The diagenesis types are complex, including compaction, cementation and dissolution. The compaction is the most fundamental reason for failure of reservoir. The porosity loss of the reservoirs in the study area caused of the compaction is 21.65 % in average. The cementation is an important factor for further reducing the reservoir pore loss, causing an average of 3.34 %. The dissolution of the reservoir is an important way to increase the hole, but due to the lack of dissolution fluid, its contribution is limited, increasing pores about 2.26 %. There is a positive correlation between the reservoir properties and maturity, and a negative correlation between the properties and depth, which show that the low maturity and deep buried Lulehe formation (E₁₊₂) has the strongest compaction and cementation, and the worst reservoir property. The property of lower Ganchaigou formation (E₃ ¹) was medium, and the upper of lower Ganchaigou formation(E₃ ²), which has the highest maturity and is the most shallow buried has the optimal reservoir property.

Key words: Qaidam basin, Lenghu region, Paleogene, diagenesis, pore evolution

中图分类号:

TE122

陈波,孙国强,史基安,郝媛媛,石海信,陈汾君. 冷湖地区古近系储层成岩作用特征及其对孔隙演化的影响[J]. 油气藏评价与开发, 2018, 8(2): 7-13.

Chen Bo,Sun Guoqiang,Shi Ji'an,Hao Yuanyuan,Shi Haixin,Chen Fenjun. Diagenesis of Paleogene formation in Lenghu region and its impact on porosity evolution[J]. Reservoir Evaluation and Development, 2018, 8(2): 7-13.

图/表 7

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层位	石英,%	长石,%	岩屑,%	Q/(F+R)
上干柴沟组上段E₃²	29.31~56.82 39.89	25.80~49.46 35.81	3.81~36.43 24.30	0.41~4.45 1.58
下干柴沟组下段E₃¹	17.0~50.21 35.48	14.13~45.86 34.21	11.22~66.43 30.31	0.20-4.01 1.38
路乐河组 E₁₊₂	13.20~49.36 27.91	12.10~54.16 28.39	3.55~6.63 43.70	0.15~2.76 0.89